... bulk density 沉积密度 fibre backing 钢纸基 flap wheels 研磨页轮 ...
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fibre backing
纤维的支持
以上为机器翻译结果，长、整句建议使用 人工翻译 。
The most promising sail material has a carbon-fibre backing coated with a thin layer (just a few tens of atoms thick) of aluminium.
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